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首页> 外文期刊>Journal of AOAC International >Novel Method for Identification and Quantification of Methanol and Ethanol in Alcoholic Beverages by Gas Chromatography-Fourier Transform Infrared Spectroscopy and Horizontal Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy
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Novel Method for Identification and Quantification of Methanol and Ethanol in Alcoholic Beverages by Gas Chromatography-Fourier Transform Infrared Spectroscopy and Horizontal Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy

机译：气相色谱-傅立叶变换红外光谱和水平衰减全反射-傅立叶变换红外光谱法鉴别和定量测定酒精饮料中甲醇和乙醇的新方法

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Numerous methods are being used to identify and quantify methanol and ethanol in alcoholic beverages, including country liquors. Some of the known methods are density and refractive index measurements, and spectrophotometric measurements using Schiff's reagent or chromatropic acid. Other advanced techniques involve head space gas chromatography (GC), GC-flame ionization detection, high-performance liquid chromatography, enzymatic reactions, and biosensors. However, identification and quantification of methanol and ethanol in beverages can be accurately done using GC-Fourier transform infrared spectroscopy (FTIR) and horizontal attenuated total reflectance (HATR)-FTIR. Identification of alcohols is possible from library matching of the IR spectra obtained from GC-FTIR. In water, methanol and ethanol show a very strong peak for C-O, stretching at 1015.3 and 1044.2 cm(-1), respectively. The strong absorption of vibrational stretching frequency of C-O present in alcohols was used for quantification purposes. The absorptions of C-O group frequency of alcohols in water mixtures were measured using HATR-FTIR with a zinc-selenide crystal. Samples were placed directly on the HATR crystal, with alcohol concentrations ranging from 0.2 to 50.0% (v/v). The plot of absorptions against concentrations of methanol and ethanol obeyed Beer's law (r(2) 0.9998 and 0.9987, respectively), from which alcohol in the mixtures was quantified. Propan-2-ol and n-butanol showed no interference. The method is validated from absorption measurements of known mixtures of standard ethanol in water. This is a simple, specific, rapid, accurate, and nondestructive method of identification and quantification of methanol and ethanol in mixtures. It can be used to ascertain methanol contamination in alcoholic beverages that can lead to death or methanol poisoning by alcohol consumption.
机译：许多方法用于鉴定和定量酒精饮料（包括乡村酒）中的甲醇和乙醇。一些已知的方法是密度和折射率测量，以及使用席夫试剂或变色酸的分光光度法测量。其他先进技术包括顶空气相色谱（GC），GC火焰电离检测，高效液相色谱，酶促反应和生物传感器。但是，使用GC-傅立叶变换红外光谱（FTIR）和水平衰减全反射率（HATR）-FTIR可以准确地完成饮料中甲醇和乙醇的鉴定和定量。从GC-FTIR获得的红外光谱库匹配中可以鉴定醇。在水中，甲醇和乙醇显示出非常强烈的C-O峰，分别在1015.3和1044.2 cm（-1）处伸展。存在于醇中的C-O的振动拉伸频率的强吸收被用于定量目的。使用具有硒化锌晶体的HATR-FTIR测量了水混合物中醇的C-O基频率吸收。将样品直接放在HATR晶体上，酒精浓度范围为0.2至50.0％（v / v）。吸光度相对于甲醇和乙醇浓度的图符合比尔定律（分别为r（2）0.9998和0.9987），从中可以对混合物中的酒精进行定量。丙-2-醇和正丁醇无干扰。该方法通过已知的标准乙醇在水中的混合物的吸收测量得到验证。这是一种简单，特异性，快速，准确且无损的鉴定和定量混合物中甲醇和乙醇的方法。它可用于确定酒精饮料中的甲醇污染，该污染会因饮酒而导致死亡或甲醇中毒。

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